Update README.md

Author: SreemonPremkumarM

README.md

@@ -4,6 +4,8 @@ This example illustrates to bind the Button command to ViewModel in [WPF TreeGri
 
 You can load a button for the columns in TreeGrid using [TreeGridTemplateColumn](https://help.syncfusion.com/cr/wpf/Syncfusion.UI.Xaml.TreeGrid.TreeGridTemplateColumn.html). When loading the buttons, you can bind a command in ViewModel using ElementName binding.
 
+In the following example, ViewModel command receives the underlying data object as command parameter, since the DataContext is bound as command parameter.
+
 ### XAML:
 ``` xml
 <syncfusion:TreeGridTemplateColumn MappingName="Title" 
@@ -18,4 +20,4 @@ You can load a button for the columns in TreeGrid using [TreeGridTemplateColumn]
 </syncfusion:TreeGridTemplateColumn>
 ```
 
-![How to Bind Button Command to ViewModel in WPF / UWP TreeGrid in MVVM](Bind_button_command_to_viewmodel.png)
+![How to Bind Button Command to ViewModel in WPF / UWP TreeGrid in MVVM](Bind_button_command_to_viewmodel.png)